Revert of DevTools: speculative unmark of worker-js-profile.html test as flaky (patchset #1 id:1 of https://codereview.chromium.org/749263003/)
Revert of DevTools: speculative unmark of worker-js-profile.html test as flaky (patchset #1 id:1 of https://codereview.chromium.org/749263003/)

Reason for revert:
There is still a source of flakiness.

Original issue's description:
> DevTools: speculative unmark of worker-js-profile.html test as flaky
> 
> It might have been fixed by r185861
> 
> TBR=yurys
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=185880

TBR=yurys@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/754073002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@185884 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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